-one: /-ōn/ (chem) suffix & ...a one for: (informal) An enthusiast f ...a-one: Adjective: A-oneOf the highest quality ...as one: [American idiom]as if a group were one ...at one: 1. Of one mind2. Reconciled (with with ...for one: Adverb: for oneAs a particular one of ...in one's: [American slang]to one's advantage; as ...no one: Pronoun: no oneNo personon one: [British slang]Phrs. Acting in a sligh ...one: Adjective: one wúnUsed of a ...one's: adj.[possessive adjective of one pron. ...one and one: [American slang]mod. having to do with ...one by one: Adverb: one by oneIn single file" ...one-and-one: Noun: one-and-oneA foul shot that must ...one-on-one: Adjective: one-on-oneDirectly between ...